pub fn position_optimize_with_share(
session: &SessionState,
begin_share: f64,
) -> PositionedOutputExpand description
Calibrated variant (#539): begin_share < 0.6 means the begin position
empirically under-performs for this client — progress moves to the end
block and the task line is duplicated there (recency rescue for the most
critical item). At the default share the layout is byte-identical to the
uncalibrated version.